6 MECHANICS OF MATERIALS KAYMA GERİLMESİ DAĞILIMI Fifth Edition MECHANICS OF CHAPTER MATERIALS 6 Ferdinand P. Beer E. Russell Johnston, Jr. John T. DeWolf David F. Mazurek EĞİLMEYE MARUZ KİRİŞLERDE Lecture Notes: J. Walt Oler Texas Tech University KAYMA GERİLMESİ DAĞILIMI © 2009 The McGraw-Hill Companies, Inc. All rights reserved.
MECHANICS OF MATERIALS Edition Fifth MECHANICS OF MATERIALS Beer • Johnston • DeWolf • Mazurek Shear on the Horizontal Face of a Beam Element Yandaki kirişte, CDC’D’ elemanının dengesi: Fx 0 H D C dA A MD MC H y dA A I Q ydA • A Statik Moment M M dM x V x D C dx Buradan, H VQ x I q H VQ kayma akıkı x I © 2009 The McGraw-Hill Companies, Inc. All rights reserved.
MECHANICS OF MATERIALS Edition Fifth MECHANICS OF MATERIALS Beer • Johnston • DeWolf • Mazurek Shear on the Horizontal Face of a Beam Element Kayma akısı, q H VQ x I burada Q y dA A y1üstündeki alanıl statik atalet momenti I I y2dA z A A' tümalan ıl atalet momenti Aynı sonuç diğer kısım içinde bulunur q H VQ q x Q Q 0 H H I © 2009 The McGraw-Hill Companies, Inc. All rights reserved.
VQ It H q x VQ x MECHANICS OF MATERIALS Edition Fifth MECHANICS OF MATERIALS Beer • Johnston • DeWolf • Mazurek Determination of the Shearing Stress in a Beam Ortalama Kayma Gerilmesi H q x VQ x A A I t x ort VQ ort It © 2009 The McGraw-Hill Companies, Inc. All rights reserved.
MECHANICS OF MATERIALS Edition Fifth MECHANICS OF MATERIALS Beer • Johnston • DeWolf • Mazurek Örnek Çözüm © 2009 The McGraw-Hill Companies, Inc. All rights reserved.
MECHANICS OF MATERIALS Edition Fifth MECHANICS OF MATERIALS Beer • Johnston • DeWolf • Mazurek Örnek-devam © 2009 The McGraw-Hill Companies, Inc. All rights reserved.
MECHANICS OF MATERIALS Edition Fifth MECHANICS OF MATERIALS Beer • Johnston • DeWolf • Mazurek Örnek-devam •Tüm kesitin ağırlık merkezi ve atalet momenti © 2009 The McGraw-Hill Companies, Inc. All rights reserved.
MECHANICS OF MATERIALS Edition Fifth MECHANICS OF MATERIALS Beer • Johnston • DeWolf • Mazurek Örnek-devam © 2009 The McGraw-Hill Companies, Inc. All rights reserved.
MECHANICS OF MATERIALS Edition Fifth MECHANICS OF MATERIALS Beer • Johnston • DeWolf • Mazurek Örnek-devam © 2009 The McGraw-Hill Companies, Inc. All rights reserved.
MECHANICS OF MATERIALS Edition Fifth MECHANICS OF MATERIALS Beer • Johnston • DeWolf • Mazurek Örnek-devam VQ It a max VQc c , c max Itc min tc min 75mm VQG VQc c min tc max , max Itc max ItG 225mm, tG 75mm © 2009 The McGraw-Hill Companies, Inc. All rights reserved. 6- 10
MECHANICS OF MATERIALS Edition Fifth MECHANICS OF MATERIALS Beer • Johnston • DeWolf • Mazurek Örnek-devam _ _ Q A. y 150x75x50 562500mm3 Q A. y 50x225x50 c c VQG 200 x10 x585937,5 79687500x75 3 max 19,6MPa ItG _ Q A. y 125x75x62.5 585937,5mm3 G VQG 200 x10 x585937,5 79687500x75 3 max 19,6MPa ItG © 2009 The McGraw-Hill Companies, Inc. All rights reserved.
MECHANICS OF MATERIALS Edition Fifth MECHANICS OF MATERIALS Beer • Johnston • DeWolf • Mazurek Shearing Stresses xy in Common Types of Beams İnce dikdörtgen kesitli kiriş, 2 VQ 3 V y Ib 2 A 1 xy 2 c 3 V max 2 A I kesitli kirişte kayma gerilmesi dağılımı VQ It ort V max Aweb © 2009 The McGraw-Hill Companies, Inc. All rights reserved.
MECHANICS OF MATERIALS Edition Fifth MECHANICS OF MATERIALS Beer • Johnston • DeWolf • Mazurek Örnek V Üç tahta parçası şekildeki gibi çivilenerek bir I profil oluşturulmuştur. Çiviler arası mesafe (kiriş ekseni boyunca) s=25 mm ve kesitteki düşey kesme kuvveti V = 500 N olduğuna göre; Her bir çivinin taşıdığı kesme kuvvetini bulunuz. Eğer çivi yerine yapıştırıcı kullanılsaydı kesitteki gerilme dağılımı nasıl olurdu? Çözüm VQ (500N)(120 106 m3) 16.20 10-6 m4 m F (0.025m)q (0.025m)(3704 N m q I 3704 N Q Ay 0.020 m 0.100 m0.060 m 120 106 m3 F 92.6 N I 1 0.020 m0.100 m3 12 2[ 1 0.100 m0.020 m3 12 0.020 m 0.100 m0.060 m2 ] 16.20 106 m4 © 2009 The McGraw-Hill Companies, Inc. All rights reserved.